NeetCode 150

A curated set of 150 problems covering every major pattern you need for coding interviews.

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Arrays & Hashing

Two Pointers

Sliding Window

Best Time to Buy and Sell Stock↻Easy
Longest Substring Without Repeating Characters↻Medium
Longest Repeating Character Replacement↻Medium
Permutation In String↻Medium
Minimum Window Substring↻Hard
Sliding Window Maximum↻Hard

Stack

Binary Search

Binary Search↻Easy
Search a 2D Matrix↻Medium
Koko Eating Bananas↻Medium
Find Minimum In Rotated Sorted Array↻Medium
Search In Rotated Sorted Array↻Medium
Time Based Key Value Store↻Medium
Median of Two Sorted Arrays↻Hard

Linked List

Trees

Invert Binary Tree↻Easy
Maximum Depth of Binary Tree↻Easy
Diameter of Binary Tree↻Easy
Balanced Binary Tree↻Easy
Same Tree↻Easy
Subtree of Another Tree↻Easy
Lowest Common Ancestor of a Binary Search Tree↻Medium
Binary Tree Level Order Traversal↻Medium
Binary Tree Right Side View↻Medium
Count Good Nodes In Binary Tree↻Medium
Validate Binary Search Tree↻Medium
Kth Smallest Element In a Bst↻Medium
Construct Binary Tree From Preorder And Inorder Traversal↻Medium
Binary Tree Maximum Path Sum↻Hard
Serialize And Deserialize Binary Tree↻Hard

Heap / Priority Queue

Backtracking

Subsets↻Medium
Combination Sum↻Medium
Combination Sum II↻Medium
Permutations↻Medium
Subsets II↻Medium
Generate Parentheses↻Medium
Word Search↻Medium
Palindrome Partitioning↻Medium
Letter Combinations of a Phone Number↻Medium
N Queens↻Hard

Tries

Implement Trie Prefix Tree↻Medium
Design Add And Search Words Data Structure↻Medium
Word Search II↻Hard

Graphs

Number of Islands↻Medium
Max Area of Island↻Medium
Clone Graph↻Medium
Walls And Gates↻Medium
Rotting Oranges↻Medium
Pacific Atlantic Water Flow↻Medium
Surrounded Regions↻Medium
Course Schedule↻Medium
Course Schedule II↻Medium
Graph Valid Tree↻Medium
Number of Connected Components In An Undirected Graph↻Medium
Redundant Connection↻Medium
Word Ladder↻Hard

Advanced Graphs

1-D Dynamic Programming

2-D Dynamic Programming

Unique Paths↻Medium
Longest Common Subsequence↻Medium
Best Time to Buy And Sell Stock With Cooldown↻Medium
Coin Change II↻Medium
Target Sum↻Medium
Interleaving String↻Medium
Longest Increasing Path In a Matrix↻Hard
Distinct Subsequences↻Hard
Edit Distance↻Medium
Burst Balloons↻Hard
Regular Expression Matching↻Hard

Greedy

Maximum Subarray↻Medium
Jump Game↻Medium
Jump Game II↻Medium
Gas Station↻Medium
Hand of Straights↻Medium
Merge Triplets to Form Target Triplet↻Medium
Partition Labels↻Medium
Valid Parenthesis String↻Medium

Intervals

Insert Interval↻Medium
Merge Intervals↻Medium
Non Overlapping Intervals↻Medium
Meeting Rooms↻Easy
Meeting Rooms II↻Medium
Minimum Interval to Include Each Query↻Hard

Math & Geometry

Rotate Image↻Medium
Spiral Matrix↻Medium
Set Matrix Zeroes↻Medium
Happy Number↻Easy
Plus One↻Easy
Pow(x, n)↻Medium
Multiply Strings↻Medium
Detect Squares↻Medium

Bit Manipulation